1K or 1-K may refer to: Astra 1K satellite Astra 1KR satellite 1K ZX Chess computer program Southern Cross Distribution (IATA code) Sutra (air company) (IATA code) BMP-1K, see BMP-1 BRM-1K, see BMP-1
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc436fccd268464a2b028c26e6352ea47215a9197dba42d816a7221dba74392a. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/827ef0d4-e943-4f87-b0c7-0704c3ec9dc0.json and https://artists.proofprofile.net/proofs/artist/827ef0d4-e943-4f87-b0c7-0704c3ec9dc0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).